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<pre class="textdiagram" id="fig4">
               +-------------+
               |             |
               |  Publisher  |
               |             |
               +-------------+
               |     PUB     |
               \-------------/
                    bind
                      |
                      |
                   updates
                      |
      +---------------+---------------+
      |               |               |
   updates         updates         updates
      |               |               |
      |               |               |
      v               v               v
   connect         connect         connect
/------------\  /------------\  /------------\
|    SUB     |  |    SUB     |  |    SUB     |
+------------+  +------------+  +------------+
|            |  |            |  |            |
| Subscriber |  | Subscriber |  | Subscriber |
|            |  |            |  |            |
+------------+  +------------+  +------------+
</pre>
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